Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae13a7f8f4dc7b6…

MALICIOUS

PDF

84.0 KB Created: 2021-06-30 15:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1e289253c663dd121eeefd1c94bf966c SHA-1: dd3018981aab4159646c6bbb9337f7b666928912 SHA-256: aae13a7f8f4dc7b62dae6b063418020e3062c9d3a746f4075cd8025ab1e0ab34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content or phishing pages. The presence of external URIs and link farm structures indicates a likely intent to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=pili+and+fimbriae+in+bacteria PDF link annotation
    • http://akgikorea.com/file_upload/fck_upfile/file/poteputavemokugobubex.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/1469409191.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a6bbc3b3be9f0874bab7ef6bba35090e/zirepemusowexajix.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d3c5b350202272f6227ba2a1d900ceb8/74480689317.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768dcb134f6---wubinibividapakujuzetume.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160acc6b88fa11---73624868779.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/narab.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/31215822938.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f250d08455---20893301991.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/0ff8cf5ed175f306f2f9464dce9ad023/revanus.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0755a97e06---widosufepuvagepufodenel.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/52329335876.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/jabexesesiguwekujoza.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb491855a---pavaja.pdfIn PDF document text
    • http://alptw.com/images/files/44160591129.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/bewadozojix.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d91db5a4ace---zazisapuzaruvafepazufufo.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/litawixokefefesodoxuwu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c3aefb12ace2d3d87041c832c4e9fe55/wijafojexagasakokunadi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2bad0ad37821efc48edd59037fe49d40/99880933074.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f29327e0---felepisuwelopidubopebut.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0f9f5694ce4676739bf09231cc7815fe/nezerobef.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/89c885f20513cd0d81a5f936a94cba32/fumuligobalep.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/004c764cdadd4d17c587ff9970718eb3/37670739009.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/minikaxadekudoxameguza.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 17120 bytes
SHA-256: 501d492b44775c5d9eb7ed9a08b224bfe603d424c4b898ed1ab8ac110514f7e0
font_01_sfnt_off000112f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0E 10488 bytes
SHA-256: 61067d89eb3127b26be9520b48c5a46dc5a64409bf040a30dac20f475573d673